John adt



STATES rrn PANT OFFICE.

JOHN ADT, OF WATERBURY, CONNECTICUT, ASSIGNOR TO HIMSELF, SAM C. DAVIS,AND SAM B. ADAMS, ASSIGNORS TO WM. B. BARNARD, OF SAME PLACE.

KNOB-LOCK.

Specification of Letters Patent No. 30,902, dated December 11, 1860.

T o all whom it may concern:

Be it known that I, JOHN ADT, of Waterbury, in the county of New Havenand State of Connecticut, have invented a new and Improved Knob-Lock;and I do hereby declare that the following is a full, clear, and exactdescription thereof, reference being had to the accompanying drawings,making a part of this specification, in which- Figure l shows theimproved lock applied to an ordinary door knob. Fig. 2 is a sectionthrough the knob, spindle, and lock. Fig. 3 shows the locking ring usedin Figs. l and 2 detached from the knob.

Similar letters of reference indicate corresponding parts in the threefigures.

The object of this invention is to apply to one of the knobs of anyordinary mortise latch, or any latch with knobs to operate it, a simpleand reliable means whereby the latch may be locked and the knobs beprevented from turning, or the latch may be unlocked'and allowed to turnfreely.

To enable those skilled in the art to freely understand my invention Iwill proceed to describe its construction and operation.

In the drawings A, is the stile of a door; B, B, are the knobs; C, C,are the roses; and D, is the latch. These parts are constructed and puttogether in any of the ordinary ways and are represented in the drawingsmerely to illustrate the operation of my inventionwhen applied to anordinary knob.

E, is the shank of the knob B which is attached to the spindle F, by ascrew a, in the usual manner except that the screw a, is long enough toproject out from the shank E a quarter or an eighth of an inch.

d, is a narrow annular metal box which is first placed loosely on theshank and pushed up closely to the knob. A wire spring c, of one or morecoils is then put on the shank E, and forced up into the box cl, by thelocking ring or tube g, which fits lover the box d, when the ring isdrawn back. The screw pin a, is now inserted and the knob with itsattachment, is screwed to the spindle leaving a portion of the pin a,projecting out from the shank E. The edge of the ring g, (that nearestto the rose on the door) has two lugs h, L, projecting from it, adepression z', formed in it, and a slot lo, cut into it between one ofthe lugs h, and the depression z', as shown clearly in Fig. 3 and inFig. 2 in red lines, in which latter view the ring is supposed to beheld back by the pin a, and the knobs are free to turn. The two lugs L,7L, have corresponding slots or notches m, in the flange of the rose C,into which they are forced and held by the spring when the ring ispartially rotated and brought in the position shown in black lines Figs.1 and 2. These lugs with the slot in the ring and the pin a, thus lockthe spindle rigidly to the rose and prevent the spindle from beingturned. To release the spindle the .ring g, is drawn back and by aslight rotation it is held back by the pin a, as shown in red linesFig.- l.

I do not claim broadly the invention of sliding rings to lock the bolt,but,

JOHN ADT.

Vitnesses NELSON J. VELTON, VEDWARD L. PRATT.

